#include "stm32f10x.h"   // Device header

void PWM_Init(void)
{
	GPIO_InitTypeDef GPIO_InitStructure; 
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
	

	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	
	TIM_InternalClockConfig(TIM2);
	
	TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
	TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
	TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
	TIM_TimeBaseInitStructure.TIM_Period = 20000 - 1;//10000 - 1
	TIM_TimeBaseInitStructure.TIM_Prescaler = 72 - 1;//7200 - 1
	TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;
	TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStructure);
	
	TIM_OCInitTypeDef TIM_OCInitStructure;
	TIM_OCStructInit(&TIM_OCInitStructure);
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
	TIM_OCInitStructure.TIM_Pulse = 0;
	TIM_OC1Init(TIM2, &TIM_OCInitStructure);
	
//	TIM_CtrlPWMOutputs(TIM1,ENABLE);	//MOE 主输出使能	
//	TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);  //CH1预装载使能	 
//	TIM_ARRPreloadConfig(TIM1, ENABLE); //使能TIMx在ARR上的预装载寄存器

	TIM_Cmd(TIM2, ENABLE);
}

void PWM_SetCompare2(uint16_t Compare)
{
	TIM_SetCompare3(TIM2, Compare);
}
